Zig

Find and Delete Object from JSON Array

See more JSON Examples

Demonstrates how to find an delete an object from a JSON array of objects. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example will delete the "Pasta" category object from Menu B.

    // {
    //   "menus": [
    //     {
    //       "name": "Menu A",
    //       "categories": [
    //             {
    //             "name": "Kebabs",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Burgers",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Pasta",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Appetizers",
    //             "description": "blah blah blah"
    //             }
    //         ]
    //     },
    //     {
    //       "name": "Menu B",
    //       "categories": [
    //             {
    //             "name": "Kebabs",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Burgers",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Pasta",
    //             "description": "blah blah blah"
    //             },
    //             {
    //             "name": "Appetizers",
    //             "description": "blah blah blah"
    //             }
    //         ]
    //       }
    //     ]
    // }

    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    json.loadFile("qa_data/json/menus.json") catch {
        std.debug.print("{s}\n", .{try json.getLastErrorText(alloc)});
        return;
    };

    // Find Menu B.
    const menu = try json.findRecord("menus", "name", "Menu B", true);
    defer menu.deinit();
    // assume menu is found..

    // Get the categories array, and then find the index of the "Pasta" menu category.
    const cat_arr = try menu.arrayOf("categories");
    defer cat_arr.deinit();
    // Assume it is found..

    // Find the object where the name of the JSON member is "name", and the value is "Pasta"
    const index = cat_arr.findObject("name", "Pasta", true);
    if (index < 0) {
        std.debug.print("Pasta not found.\n", .{});
    } else {
        // Delete the "Pasta" category record from Menu B
        try cat_arr.deleteAt(index);
        // Assume OK..
    }

    // Examine the JSON to see if it worked as expected..
    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});
}